US4344981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for modifying surface properties of a shaped article of a silicone
Assignee: Shin-Etsu Chemical Co Ltd
•
Filing: 1980-06-11
•
Granted: 1982-08-17
•
Expires: 2000-06-11
Abstract
Abstract A novel method is proposed for improving the surface properties or, in particular, for increasing the affinity to water of the surface of a shaped article made of a silicone, e.g. a silicone rubber. The inventive method comprises first exposing the surface of the shaped article of the silicone to low temperature plasma of an inorganic gas and then bringing the plasma-treated surface into contact with a liquid inert to the silicone which is an aqueous solution containing a surface active agent. The treated surface retains sufficient affinity to water even 6 months after the treatment.
Inventors
- 👤 Kiyoshi Imada
- 👤 Susumu Ueno
- 👤 Yasuhide Nishina
- 👤 Hirokazu Nomura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:47
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/123; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
A method for modifying the surface properties of a shaped article of a silicone to increase its affinity for water and decrease its electrostatic surface charge which comprises the steps of: (a) subjecting the surface of the shaped article to exposure to a low temperature plasma of an inorganic gas, and (b) within 24 hours after completion of step (a), bringing the plasma-treated surface of the shaped article into contact with an aqueous solution containing a surface active agent, wherein the length of time in which the plasma-treated surface of the shaped article is in contact with the aqueous solution containing a surface active agent is at least one second, and the concentration of the surface active agent in the aqueous solution is in the range from about 0.01 to 10% by weight.
Claim 2
Independent Claim
133 words
A method for modifying the surface properties of a shaped article of a silicone to increase its affinity for water and decrease its electrostatic surface charge which comprises the steps of: (a) subjecting the surface of the shaped article to exposure to a low temperature plasma of an inorganic gas, and (b) within 24 hours after completion of step (a), bringing the plasma-treated surface of the shaped article into contact with an aqueous solution containing a surface active agent, wherein the length of time in which the plasma-treated surface of the shaped article is in contact with the aqueous solution containing a surface active agent is at least one second, and the concentration of the surface active agent in the aqueous solution is in the range from about 0.01 to 10% by weight.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein step (b) is carried out at a temperature in the range from about 0° to 50° C.
Claim 4
Dependent Claim
21 words
The method as claimed in claim 1 wherein the inorganic gas is carbon monoxide or a gaseous mixture containing carbon monoxide.
References Cited (Backward Citations)
US3959105A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |